Means for suspending the shafts of gyratory crushers



Oct. 22, 9 3 'P. M. E. BARROT ETAL 8 MEANS FOR SUSPENDiNG THE SHAFTS 0F GYRATORY RUSHERS Filed April 5, 1962 2 sheets-sheen W44: W Win/mi 'MJW 0611- 22, 1963 r P. M. E. BARROT ETAL 3,107,363

MEANS FOR SUSPENDING THE SHAFTS OF GYRATORY CRUSHERS Filed April 5, 1962 2 Sheets-Sheet 2 Md. M J W fz f mwt United States Patent 3,167,863 MEANS FGR SUPENDWG THE SHAFTS 03E GYRATORY CRUSHERS Pani Marcel Emiie Barret, Clichy, and Qlaude Yves Lucien Lemardeiey, Paris, France, assignors to Rabbitless, Paris, France, a corporation of France Filled Apr. 5, 1962, Ser. No. 135,376. Claims priority, application France Apr. 13, 1961 6 Claims. (Cl. 241-211) The present invention relates to improvements in gymtory crushers of the type, for example, described in French Patent 854,229 of December 24, 1938. More particularly, the invention relates to means permitting the construction of an oleopneumatic or hydraulic suspension for gyratory crushers which bear only axial stresses.

In much of the material customarily crushed in gymtory cr-ushers it is possible for foreign bodies (pieces of steel, for example) to be found. In this event, these pieces are either crushed, despite their great strength, or they cause the crusher to stop running (because a safety device breaks, a drive belt becomes loose, the fuses blow, the circuit-breaker opens, or the motor stalls). The metallic pieces remain jammed in the chamber of the crusher and before the apparatus can be restarted, they must be removed. This nnjamming is a long and difficult task, often requiring an oxyacetylene torch to cut up these pieces.

To somewhat mitigate these disadvantages, there are means enabling the shaft automatically to lower when there are metallic pieces within the crushing chamber, so as to progressively enlarge the outlet opening, and thereby prevent the apparatus from being overloaded. In some present schemes, the shaft is automatically returned to its original position after the foreign bodies are removed.

The known arrangements, "as thus realized, are either spring arrangements, in which case they are cumbersome, difficu-lt to adjust, very limited in their action, and generally difiicult to use and unreliable; or they are pneumatic suspension arrangements (compressed air), which are rarely used because of their cumbersomeness, or else they are oleopneumatic or hydraulic arrangements placed at one or the other end of the crusher shaft.

Up to now, those arrangements that are at the foot of the shaft have the disadvantage of being placed in the very heart of the mechanism and being exposed to rotational stresses due to the rotation transmitted to the foot of the shaft by the eccentric. This is very detrimental to the tightness of the joints of the elecpneumatic or hydraulic system, because they are shifted at each turn of the eccentric in a combined rotational and oscillatory movement.

Those arrangements that are at the top or 'head of the shaft are also very delicate, because of the same combined rotational and oscillatory movement at the top of the shaft.

According to one form of the invention, a jack unit is mounted on the upper end of a sleeve through which the shaft of the crusher is supported by a cross brace, the shaft being slidably mounted in the sleeve and the piston of the jack being axially rigid with the upper end of the shaft.

The upper end of the shaft can be made solid with the piston of the jack by means of another shaft; but in an alternative arrangement, the piston of the jack, which, in such a case, has a diameter larger than that of the crusher shaft, has a central part that axially completely spans the cylinder in a fluid tight manner. This central part has an axial bore in which the shaft of the crusher fits and is longitudinally held.

In the alternative form, the shaft is preferably held in the piston by some means rigid with the shaft and resting freely on the upper face of the central part of the jack piston. Thus, the shaft is suspended in the piston, yet is free to rise with respect to it, thereby simplifying the assembly and increasing the reliability of the arrangement.

Two embodiments of the invention will now be described, with reference to the accompanying drawings, in which:

FIGURE 1 is a vertical cross-sectional view of a first embodiment of the invention.

FIGURE 2 is a similar view of an alternative embodiment of the device according to the invention.

In the embodiment of FIGURE 1, the shaft 11 of the crusher is slidab'ly mounted in a bearing sleeve 12,

.which is disposed in :bnsh 13 and rests on rim 17 through washer 18. The outer surface of the bearing sleeve is conically-shaped, having a relatively smaller outside diameter at the upper end and a relatively larger outside diameter at its lower end. This conical shape allows the bearing sleeve to tilt within the bush 13 with the shaft 25 when the shaft 25 moves in a gyratory path. Bush 13 fits in bore 14 of stationary cross member 15.

The upper portion of movable bearing sleeve member 12 is constructed to receive hydraulic jack cylinder element 19, the piston rod element 20 of which is made axially rigid with shaft 11 in any known manner. In this way, the jack moves with the shaft but the piston rod is completely free of any transverse stress.

If desired, there can be introduced into radial slots provided for this purpose in the upper part of shaft 11, means, such as keys, wedges, or cotters 21, engaging slots or grooves or channels 22, which are arranged according to the generatrices of the bore of sleeve 12. These means prevent any rotation of the shaft and of the piston relative to the cylinder ,of the jack, without preventing the vertical sliding of shaft 11 in sleeve 12, when adjusting the height of the shaft with the help of the jack suspension.

The arrangement of FIGURE 2 is a variation of the embodiment of FIGURE 1.

In this embodiment, shaft 25 of the crusher is slidably mounted in bearing sleeve 26 having a conical outer surface and located in bush 27, which tits in bore 28 of cross member 29. Sleeve or moving member 26 rests upon internal rim 3d of the cross member through a washer 31. However, in this variation shaft 25 passes through the piston means or the central cylindrical part 32 of the radially outwardly extending piston part 33 of a hydraulic jack or jack unit, of which the cylinder 34, through which part 32 slides in a fluid tight manner, rests on flange 35' formed in the upper part of sleeve 26.

On the upper end of shaft 25, by means of a truncated cone collar 36 acting as a tightening wedge and urged downwardly by a plate 37 secured to the top of the shaft, there is secured sleeve 38 resting on the upper edge, through washer 39, of part 32 of the jack piston.

The operating conditions of this arrangement are the same as for the embodiment of FIGURE 1, the only difference being that shaft 25 is free to move axially upward independent of the jack, thereby substantially facilitating construction and providing an arrangement possessing certain advantages.

What We claim is:

1. A device for suspending the shaft of a gyratory crusher mechanism having a stationary member, said device comprising a movable member mounted to tilt relatively to said stationary member; a jack unit comprising a cylinder element and. a piston element, one of said elements being mounted on said movable member to tilt therewith, said shaft being mounted to slide rela- =tively to said movable member and being connected to the other of said elements whereby said shaft is axially displaccable with said other of said elements relatively to said one of said elements, said movable member and said stationary member; said shaft, said movable memher and said jack unit being tiltable in unison relatively to said stationary member with substantially no transverse stress being imposed on said jack unit.

2. The means of claim 1, in which said shaft is formed with a plurality of radial slots; said movable iernber having a plurality of cooperating vertical channels; and a means engaging said radial slots and said vertical channels, whereby said shaft and said other of said jack unit elements are prevented from rotating with respect to said one of said jack unit elements.

3. A device as claimed in claim 1 wherein said other of said jack unit elements and said shaft are coaxial and are rigid with one another.

4. A device as claimed in claim 1 wherein said movable member surrounds said shaft in bearing relation thereto, and wherein said other of said jack unit elements is formed with a bore through which said shaft extends.

5. A device as claimed in claim 4 wherein said other of said jack unit elements is the jack unit piston, said piston having a central cylindrical part for-med with said bore and a part extending radially outwardly from said central cylindrical part and engaging the jack unit cylinder element.

6. A device as claimed in claim 1 wherein said movable member is formed with an outer surface shaped as a section of a cone.

References Cited in the file of this patent UNITED STATES PATENTS 509,597 McCuily July 4, 1893 2,646,728 COghill July 28, 1953 2,799,456 Beh-r July 16, 1957 2,820,596 Broman Jan. 21, 1958 

1. A DEVICE FOR SUSPENDING THE SHAFT OF A GYRATORY CRUSHER MECHANISM HAVING A STATIONARY MEMBER, SAID DEVICE COMPRISING A MOVABLE MEMBER MOUNTED TO TILT RELATIVELY TO SAID STATIONARY MEMBER; A JACK UNIT COMPRISING A CYLINDER ELEMENT AND A PISTON ELEMENT, ONE OF SAID ELEMENTS BEING MOUNTED ON SDAID MOVABLE MEMBER TO TILT THEREWITH, SAID SHAFT BEING MOUNTED TO SLIDE RELATIVELY TO SAID MOVABLE MEMBER AND BEING CONNECTED TO THE OTHER OF SAID ELEMENTS WHEREBY SAID SHAFT IS AXIALLY DISPLACEABLE WITH SAID OTHER OF SAID ELEMENTS RELATIVELY TO SAID ONE OF SAID ELEMENTS, SAID MOVABLE MEMBER AND SAID STATIONARY MEMBER; SAID SHAFT, SAID MOVABLE MEMBER AND SAID JACK UNIT BEING TILTABLE IN UNISON RELATIVELY TO SAID STATIONARY MEMBER WITH SUBSTANTIALLY NO TRANSVERSE STRESS BEING IMPOSED ON SAID JACK UNIT. 